【摘要】 基于朗伯-比尔吸收定律建立了便携式非色散红外气体传感体系,并成功的应用于火灾现场生成气体的实时检测。该体系利用直接电调制的红外辐射源、窄带薄膜干涉滤光片和高灵敏度的TGS热释电红外探测器,很大程度地降低了系统的成本和体积,提高了探测灵敏度。通过对CO、CO2、NH3和SO2四种火灾现场燃烧生成气体在不同浓度状态下的测量,证明系统对所测气体可以达到了几十个微量级的探测极限,响应时间均小于20s,具有较好的稳定性,能够满足一定的测量要求。更多还原

【Abstract】 Infrared （IR） absorption is one of the most reliable and accurate mesaurement techniques for gas sensing. We present a non-dispersive infrared （NDIR） system developed for absorption-based gas sensing. The system can provide a ralatively accurate method for the mesaurement of gas concentration. Several gases, including CO, CO₂, NH₃ and SO₂, have been measured with this instrument. The results of the measurement prove that the system has acceptable sensitivity and stability with a detection limit of several decades ppm.更多还原